String[] syntax = command.split(" ");
if(syntax[1] == "cd"){
cd cd = new cd();
cd.getCD();
Whenever I run this, I get an error thats confusing. I am almost 100% sure this has to do with strings or escaping. What did I do wrong?
2 Answers
Two possible issues:
When comparing Strings, use .equals(), not ==.
The first element of an array is always 0, not 1.
1 Comment
kzidane
I guess it is always one possible issue that is related to ArrayIndexOutOfBoundsExceptions that is the used index does not exist. comparing strings with either == or equals() is not the main issue as long as the string to be compared doesn't exit.
You haven't closed your if-statement. Also use .equals() not == for strings.
Can you show of the rest of the code? I made a small working program with your code.
In Java == is the reference of the object, but equals() checks if it's the identical string (character by character is identical).
The ArrayIndexOutOfBoundsException might have occurred since you chose index 1 instead of 0. Since indexes start at 0 in Java this might be your problem.
Working example.
public static void main(String[] args) {
String command = "cd temp";
String[] syntax = command.split(" ");
if(syntax[0].equals("cd")){
CD cd = new CD();
cd.getCD();
System.out.println(cd.getCD());
}
}
static class CD {
private String title;
public CD() {
title = "unnamed";
}
public String getCD() {
return title;
}
}
3 Comments
Pshemo
If you are sure that it is not problem then why you are posting this as answer instead of comment?
knordbo
@Pshemo I can't put code in comment. Also the issue might be index etc. so I'm going to make a working example here!
Pshemo
First part of your answer:
You haven't closed your if-statement. Also use .equals() not == for strings. Can you show of the rest of the code? is good comment, but it doesn't answer the question why OP is getting ArrayIndexOutOfBoundsException. Also showing working example is not the same as explaining what changes you made and why ware they necessary.
I get an error thats confusingis not helpful way to describe your error.CD, notcd). Arrays are zero-indexed. Compare strings (and other objects) with.equals, not==.